package chapter05;

public class Example09 {
    private static final int TIMES = 100000;
    public static void main(String[] args){
        Example09.testString();
        Example09.testStringBuffer();
        Example09.testStringBuilder();
    }
    public static void testString(){
        long startTime = System.currentTimeMillis();
        String str = "";
        for (int i = 0; i < TIMES;i++){
            str += "test";
        }
        long endTime = System.currentTimeMillis();
        System.out.println("String test usedtime:"+(endTime - startTime));
    }
    public static void testStringBuffer(){
        long startTime = System.currentTimeMillis();
        StringBuilder str = new StringBuilder();
        for (int i = 0; i<TIMES; i++){
            str.append("test");
        }
        long endTime = System.currentTimeMillis();
        System.out.println("StringBuffer test usedtime: "+ (endTime - startTime));
    }
    public static void testStringBuilder(){
        long startTime = System.currentTimeMillis();
        StringBuilder str = new StringBuilder();
        for (int i = 0;i < TIMES;i++){
            str.append("test");
        }
        long endTime = System.currentTimeMillis();
        System.out.println("StringBuilder test usedtime:"+(endTime - startTime));
    }
}
